Added CRA polyfill solution text to save dev time

[emg110]

Added simple guide content to overcome the polyfill issue of Webpack 5 and above in React implementations, especially CRA-based ones. The content, offers the fix for this problem without any patching or ejecting and opens the door to implement more custom Webpack plugins in action as well, just by a config line in the 'config-overrides.js' file.